Merge bitcoin/bitcoin#24710: Add concrete steps in doc/cjdns.md to easily find a friend

6a02355ae9e830ea40b5408acc564e9eb1da1378 Add and improve informational links in doc/cjdns.md (Jon Atack)
19538dd41ecd9f593ad56f1f5f3a2cb45ad2b4ef Add concrete steps in doc/cjdns.md to easily find a friend (Jon Atack)

Pull request description:

  and improve the informational links.  CJDNS functions with a friend-of-a-friend topology and a key hurdle to getting started is to find a public peer and set up an outbound connection to it. This update makes doing it much easier for people getting started.

  Credit to Vasil Dimov for an [IRC suggestion in October 2021](https://www.erisian.com.au/bitcoin-core-dev/log-2021-10-04.html#l-469) and to stickies-v for IRC discussions this week and the [testing guide](https://github.com/bitcoin-core/bitcoin-devwiki/wiki/23.0-Release-Candidate-Testing-Guide) that led me to redo these steps, provide feedback at https://github.com/bitcoin/bitcoin/issues/24706 and refine the added documentation here.

ACKs for top commit:
  dunxen:
    ACK 6a02355
  stickies-v:
    re-ACK [6a02355](https://github.com/bitcoin/bitcoin/commit/6a02355ae9e830ea40b5408acc564e9eb1da1378) even though I wasn't opposed to the "friend" terminology since it's the language CJDNS seems to use to denominate the peers you connect to directly in general. Not worth bikeshedding over though.
  lsilva01:
    Strong ACK 6a02355

Tree-SHA512: b2fa2a200a6a55a709486f7ed2d3830cabffbbffa61a0d211fcb666a918b5754d4e99a58c32909fe58540598066e6ff67bf2fa2fcd56b1b5dcff3c2162f6d962

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